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Erschienen in:
1984 | OriginalPaper | Buchkapitel
A Cell Model for Microstructural Evolution during Sintering
verfasst von : R. T. DeHoff
Erschienen in: Materials Science Research
Verlag: Springer US
Enthalten in: Professional Book Archive
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A rigorous description of the geometric evolution of microstructure during sintering is presented, based upon two alternate spacefilling constructs: cells associated with the grains in the system, and bipyramids associated with the cell faces. Relations are derived between the rate of densification and the rate of annihilation of vacancies and also appropriate average concentration gradients in the solid phase at its surface. An efficiency factor is defined which describes the conversion of the volume of vacancies annihilated to the global volume shrinkage of the system. These relationships are free from simplifying geometric assumptions, and have potential application to all stages of powder processing.